* Table A.8: introduce tarred road and interaction between tarred road and distance
  gen dist_dw_hf_2_tarred = dist_dw_hf_2*tarred
  gen dist_22_tarred = dist_22*tarred

  matrix b54 = b50[1,1..6], 0.0, 0.0, 0.0, 0.0, 0.003, 0.26, 0.001, 0.0, 0.0, 0.0, 0.0,  0.001, 0.01, 0.0, 0.0, 0.0, 0.0, 0.0
  
  set seed 101
  mixlogit d_  dist_dw_hf_2 dist_22   nu_8d  alt2-alt4  nu_8dsq tarred dist_dw_hf_2_tarred dist_22_tarred, group(choicesit) id(idid) cluster(q01_10) rand(doctor_tot  generator2009 beds p_i1 p_i2 p_i3 p_i4 ) from(b54, copy) 
  est store mixl51d_tarred